Thank you so much for responding to me so promptly - I really appreciate it. The last blood-test I had was done by a Haematologist and, as my GP, didn't seem to react negatively to the report, I can only assume that the specialist wasn't unduly concerned. However, your answer has given me some specifics that I can raise with my GP so that he can either put my mind at rest or, if he has not considered these options, do something about it.